<template>
  <div class="permission-container">
    <div class="app-container">
      <!-- 表格 -->
      <el-card>
        <div style="text-align: right; margin-bottom: 20px">
          <el-button
            type="primary"
            size="small"
            @click="hAdd(1, '0')"
          >添加权限</el-button>
        </div>
        <el-table border :data="list" row-key="id">
          <el-table-column label="菜单名称" prop="name" />
          <el-table-column label="权限标识" prop="code" />
          <el-table-column label="描述" prop="description" />
          <el-table-column label="操作" width="300px">
            <template slot-scope="scope">
              <!-- type为1时为页面级访问权限，它可以继续做添加： 设置页面下边某个功能是否可以操作 -->
              <!-- type为2时为按钮级别的访问权限，它就不能再继续细分了，它就没有添加了 -->
              <el-button
                v-if="scope.row.type === 1"
                type="text"
                @click="hAdd(2, scope.row.id)"
              >添加权限</el-button>
              <el-button type="text">查看api权限</el-button>
              <el-button
                type="text"
                @click="hEdit(scope.row.id)"
              >查看</el-button>
              <el-button
                type="text"
                @click="hDel(scope.row.id)"
              >删除</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-card>
      <el-dialog
        :visible.sync="showDialog"
        :title="isEdit ? '编辑' : '添加'"
        @close="resetForm"
      >
        <!-- 表单内容 -->
        <el-form
          ref="form"
          label-width="100px"
          :rules="rules"
          :model="formData"
        >
          <el-form-item label="权限名称" prop="name">
            <el-input v-model="formData.name" />
          </el-form-item>
          <el-form-item label="权限标识" prop="code">
            <el-input v-model="formData.code" />
          </el-form-item>
          <el-form-item label="权限描述" prop="description">
            <el-input v-model="formData.description" />
          </el-form-item>
          <el-form-item label="权限启用" prop="enVisible">
            <el-switch
              v-model="formData.enVisible"
              active-text="启用"
              active-value="1"
              inactive-text="不启用"
              inactive-value="0"
            />
          </el-form-item>
        </el-form>

        <template #footer>
          <div style="text-align: right">
            <el-button @click="showDialog = false">取消</el-button>
            <el-button type="primary" @click="hSubmit">确定</el-button>
          </div>
        </template>
      </el-dialog>
    </div>
  </div>
</template>

<script>
import { todo } from '@/utils/index'
import {
  getPermissionList,
  addPermission,
  delPermission,
  updatePermission,
  getPermissionDetail
} from '@/api/permissions'
export default {
  data() {
    const validCode = (rule, value, callback) => {
      // 添加时的校验：code不能重复
      let existCodeList = this.originList
      if (this.isEdit) {
        // 编辑时的校验: code能取自己
        existCodeList = this.originList.filter(
          (item) => item.id !== this.formData.id
        )
      }
      existCodeList.map((it) => it.code).includes(value)
        ? callback(new Error(value + '已经占用'))
        : callback()
    }

    const validName = (rule, value, callback) => {
      // 添加时的校验： 名字不能取子元素的名字
      let existNameList = this.originList.filter(
        (item) => item.pid === this.formData.pid
      )
      if (this.isEdit) {
        // 编辑时的校验： 名字不能取兄弟（排除自己）的名字
        // 找兄弟，排除自己
        existNameList = this.originList.filter(
          (item) =>
            item.pid === this.formData.pid && item.id !== this.formData.id
        )
      }
      existNameList.map((it) => it.name).includes(value)
        ? callback(new Error(value + '已经占用'))
        : callback()
    }
    return {
      list: [],
      showDialog: false, // 是否显示弹层
      formData: {
        name: '', // 名称
        code: '', // 权限标识
        description: '', // 描述
        enVisible: '0', // 开启
        pid: '', // 添加到哪个节点下
        type: '' // 类型
      },
      isEdit: false,
      rules: {
        code: [
          { message: '不能为空', required: true, trigger: 'blur' },
          { validator: validCode, trigger: 'blur' }
        ],
        name: [
          { message: '不能为空', required: true, trigger: 'blur' },
          { validator: validName, trigger: 'blur' }
        ]
      },
      originList: [] // 在做校验时需要用到的数据
    }
  },
  created() {
    this.loadPermissionList()
  },
  methods: {
    async loadPermissionList() {
      try {
        const res = await getPermissionList()
        // console.log('获取权限数据', res.data)
        this.list = todo(res.data, '0')
      } catch (err) {
        // console.log(err)
      }
    },
    hAdd(type, id) {
      this.isEdit = false
      this.showDialog = true
      // 记录当前添加的关键信息
      this.formData.type = type
      this.formData.pid = id
    },
    hSubmit() {
      this.$refs.form.validate((valid) => {
        if (valid) {
          // 做添加 或者 编辑
          this.isEdit ? this.doEdit() : this.doAdd()
        }
      })
    },
    // 用户点击了编辑
    async hEdit(id) {
      this.isEdit = true
      // alert(id)
      // 1. 根据id去获取详情
      const res = await getPermissionDetail(id)
      // console.log('从后端返回的权限点详情数据是', res)
      // 2. 填充在表单中
      this.formData = res.data
      // 3. 显示弹层
      this.showDialog = true
    },
    async doAdd() {
      try {
        await addPermission(this.formData)
        // console.log(res)
        this.showDialog = false
        this.loadPermissionList()
        this.$message.success('添加成功')
      } catch (err) {
        // console.log(err)
        this.$message.error('添加失败')
      }
    },
    async doEdit() {
      try {
        const res = await updatePermission(this.formData)
        console.log(res)

        this.showDialog = false
        this.loadPermissionList()
        this.$message.success('修改成功')
      } catch (err) {
        // console.log(err)
        this.$message.error('修改失败')
      }
    },
    // 当弹层关闭时，重置表单
    resetForm() {
      // 1. 重置表单
      this.formData = {
        name: '', // 名称
        code: '', // 权限标识
        description: '', // 描述
        enVisible: '0', // 开启
        pid: '', // 添加到哪个节点下
        type: '' // 类型
      }
      // 2. 清空校验
      this.$refs.form.resetFields()
    },
    async doDel(id) {
      try {
        await delPermission(id)
        // console.log(res)

        this.loadPermissionList()
        this.$message.success('删除成功')
      } catch (err) {
        // console.log(err)
        this.$message.error('删除失败')
      }
    },
    // 用户点击删除
    hDel(id) {
      // alert(id)
      this.$confirm('你确定要删除吗？')
        .then(() => {
          this.doDel(id)
        })
        .catch(() => {})
    }
  }
}
</script>
